MIL-PRF-24176C
Any container in the sample having defects or under required fill shall be rejected, and if any defective containers
in any sample are not replaced for the appropriate sampling plan of ASQC Z1.4, the lot represented by the sample
shall be rejected.
4.3.1.4 Lot acceptance. The inspection test samples selected in accordance with 4.3.1.2 shall be
subjected to the applicable tests specified in 4.4 and 4.5 except for the adhesion test after the 3-month curing
period and for the storage stability test (see 3.5.5 and 3.5.8). The contractor shall not release a lot until a
favorable report is received from the laboratory. Nonconformance of a sample shall be basis for rejection of the
lot represented by the sample.
4.4 Conformance tests. Conformance tests for each lot shall consist of all the tests specified in 4.5,
except for the adhesion test after the 3-month curing period and for the storage stability test (see 3.5.5 and 3.5.8).
4.4.1 Rejection. If any sample is found not to be in conformance to the requirements of this
specification, this shall be cause for the rejection of the lot represented by the sample.
4.5 Test methods.
4.5.1 Test conditions. Unless otherwise specified, test conditions shall be temperature 25 ± 1°C (70°F ±
2°F) and relative humidity 30 - 80%, using a pre-test conditioning period of 48 hours. The conditioned
components of the cement shall be mixed in the proportions recommended by the manufacturer and in a manor to
produce a uniform color (see 3.5.2).
4.5.2 Hardness. The hardness test shall be performed in accordance with ASTM D 2240, Type D.
Hardness readings shall be determined upon the cemented channel test specimen utilized in 4.5.7. Five random
readings shall be made following a 72-hour curing period of the cemented channel. The average of the five
readings shall be reported.
4.5.3 Color. Visual examination of the components shall show sufficient contrast in colors so as to
produce a new uniform color after combining the two components in the specified proportions and mixing.
4.5.4 Pot life. The pot life of the cement shall be determined at temperatures of 21 ± 1°C to 32 ± 1°C
(70 ± 2°F to 90 ± 2°F). The components of the cement prior to mixing shall be conditioned for a period of 4
hours at each specified temperature. The consistency of the components and the mixed cement shall be smooth,
uniform, free of lumps and readily mixable by hand. A sufficient amount of cement shall be prepared and
immediately introduced into a flat bottom cylindrical metal container approximately 55 millimeters (mm) (2-3/16
inches) in diameter and 35 mm (1-3/8 inches) in depth (e.g., tin ointment box). The time at which the container is
completely filled with cement shall be noted as the starting time. A clean wooden tongue depressor shall be used
periodically to probe the surface of the cement to a depth of approximately 3 mm (1/8 inch). The tongue
depressor shall be held in a vertical position when probing. The duration of time from the starting time until the
cement no longer adheres to the clean end of a probe shall be recorded as the pot life.
4.5.5 Application characteristics. A steel channel approximately 125 mm (5 inches) long by 75 mm (3
inches) wide by 6 mm (1/4 inch) deep shall be constructed. All metal plate surfaces to be utilized for test
purposes shall be cleaned and finished with a No. 60 aluminum oxide cloth. The channel, while in a horizontal
position, shall be completely filled with freshly-prepared cement and the excess cement removed by drawing a
straight edge across the top edges of the channel. Dragging or clinging of the cement to the straight edge resulting
in incomplete fill of the channel or production of a rough cement surface shall be cause for rejection.
4.5.6 Resistance to vertical sagging. Upon completion of the test specified in 4.5.5, the mixed but
uncured cemented test specimen shall be used to determine the resistance of the cement to vertical sagging. Any
excess cement that may extend beyond the open ends of the channel shall be removed with the straight edge and the
channel positioned so that its long dimension is in a vertical position. Any sagging of the cement below the lower
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